Malt-drum.



No. 69l,47|. Patented Ian. 2|, I902.

F. KNUTTEL.

MALT DRUM.

(Application filed Oct. 11. 1901.) (No Model.) 2 Sheets-Shaet I.

Tu: yonms PETERS co, Pnoruuwu, wnsnmmu, n, c.

No. 69l,47|. Patented Jan. 2|, I902.

F. KNUTTEL.

MALT DRUM.

(Application filed. Oct. 11, 1901. (No Model.) 2 Sheets-Sheet 2.

WITNES5ES: INVENTOR:

FRIEDRICH KNUTTEL HIS ATTORNEY THE uonms PETERS co puoruuvlou WASHINGTON n. c.

' UNITED STATES PATENT OFFICE.

FRIEDRICH KNUTTEL, OF OHARLOTTENBURG, NEAR BERLIN, GERMANY.

MALT-DRUM.

$PECIFIGATION forming part of Letters Patent No. 691,471, dated January 21, 1902.

Application filed October 11, 1901. Serial No. 78,386. (No model.) I

To all whom it may concern:

Be it known that I, FRIEDRICH Kniirrnn, a subject of the King of Prussia, Emperor of Germany, residing at No. 6 Franklinstrasse, Charlottenburg, near Berlin, in the Kingdom of Prussia, German Empire, have invented new and usefulImprovementsinMalt-Drums, of which the following is a specification.

This invention relates to improvements in malting and drying drums, and has for its object to render more uniform the circulation of air in the malt.

In the hitherto-known malt-dru ms with rotating shell, in which the malt is'ventilated by means of a perforated central tube in combination with perforated tubes disposedon the shell or located near the shell concentrically to the central tube, it has been found that the ventilating or heating of the malt between two adjacent ventilating-tubes, the central tube, and the drum-shell was not sufficiently uniform, as the air-current proceeding from the ventilating-tubes had the tendency to escape on the shortest path toward the central tube, through which the air is exhausted. This objection is overcome in the present invention by the ventilating-tubes being irregularly perforated in such manner thatthe holes provided in the same are increased in number in proportion to their distance from the central tube, so that the side of the ventilating-tubes directed toward the drum-shell is perforated to a larger degree, while, inversely, the side toward the central tube being perforated to a lesser degree the escaping air-currents become more evenly distributed over the malt.

It is immaterial for the efficient operation of the malt-drum whether the air passes through the malt from the ventilating-tubes toward the central tube or from the central tube to the ventilating-tube.

The invention is illustrated in the accompanying drawings, in which- Figure 1 is a longitudinal section through the malt-drum; Fig. 2, a cross-section of a section of the drum on an enlarged scale; Fig. 3, is a similar section showing a modified form on an enlarged scale. Fig. 4 shows a longitudinal section on line 4: 4, Fig. 2, looking in the direction of the arrow.

As represented in Fig. 1, the malt-drum consists of the rotating closed shell to, the central air-tube I), open only on the one side and connected with the discharge-pipe c, the ventilating-tubes d, arranged concentrically to the central tube 1), open on the opposite side and connected with the air-chamber 6, provided in the head of the shell a, to which airchamber leads the air-supply pipe f. To effect a more uniform ventilation of the malt, a slide 0 is provided in the air-chamber e, which cuts off the inlet of air to such of the ventilating-tubes which at the same time are in the empty space above the malt.

For the purpose of obtaining a more uniform ventilating or heating of the malt throughout the drum the ventilating-tubes d, according to the present invention, are irregularly perforated, as shown in Figs. 2 and 4, in such manner that the holes are, for instance, increased in number in proportion to their distance from the central tube, so that the area of the surface of the holes toward the central tube is smaller than that of the holes toward the drum-shell, whereby the air escapes in greater quantity from the ventilating tubes through the side having the larger number of holesi. 6., in this instance, toward the shell, as shown in the drawings by the increased length of the arrows.

In the modification represented in Fig. 3 the irregularly-perforated ventilating-tubes d are semicircular in shape and disposed directly upon the drum-shell a.

If desired, both forms of construction of the ventilating-tubes can be employed for one and the same drum.

What I claim, and desire to secure by Letters Patent of the United States, is

A revolving drum for malting and drying grain comprising an outer shell, a central perforated tube closed at one end of the drum, perforated ventilating-tubes closed at the opposite end of the drum and communicating with the air-chamber and means for supplying the ventilating-tubes with moist or heated air, the perforations of the ventilating-tubes increasing in number in proportion to their distance from the central tube, essentially as and for the purpose described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

FRIEDRICH KNUTTEL.

Witnesses:

HENRY HASPER, WOLDEMAR HAUPT.

ICO 

